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Obtaining rotation from CTM

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Obtaining rotation from CTM

Subject: Obtaining rotation from CTM
From: Tilman Bender <email@hidden>
Date: Thu, 21 Aug 2008 15:56:58 +0200

Hi there,

Is it possible to obtain the angle of rotation from a tranformation- matrix created with CGAffineTransfrom?

Background: I am building a simple kitchen-timer app, that should work like the ones in your mom's kitchen: You set the time by touching a control and rotating it. Now I would like to obtain the current angle of my clock.

I know how to use and create CGAffineTransform stuff, but I am not really familiar with the extraction of specific information from such a matrix.

kind regards
Tilman Bender
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